Your question covers a few points, which is usually discouraged here but as you are a new parent and new to this site I'll let it slip.

A few suggestions:

1. If your baby always cries when in a horizontal position, I suggest talking to your healthcare provider. Some babies have reflux problems (similar to heartburn in adults), which can be really painful. This needs professional examination / treatment. Do not hesitate.
2. 8 hours is not enough sleep for a newborn. Yet point 1 could be the reason for frequent waking/crying. Normally a baby "takes" as much sleep as it needs, if not, there is a reason. But sleep training is absolutely not the solution for a 1mo. I'm not a fan of it myself, but all sources I know say a baby should be at least 6 month old before you start.
3. If you need to keep your baby upright (please, no "sitting" yet!), I suggest you try babywearing. This means using Speaking from experience I can recommend the products of Didymos, but I'm in Germany. Our first child slept in his first year almost exclusively if in close contact to our bodies, so I can relate.

Your question covers a few points, which is usually discouraged here but as you are a new parent and new to this site I'll let it slip.

A few suggestions:

1. If your baby always cries when in a horizontal position, I suggest talking to your healthcare provider. Some babies have reflux problems (similar to heartburn in adults), which can be really painful. This needs professional examination / treatment. Do not hesitate.
2. 8 hours is not enough sleep for a newborn. Yet point 1 could be the reason for frequent waking/crying. Normally a baby "takes" as much sleep as it needs, if not, there is a reason. But sleep training is absolutely not the solution for a 1mo. I'm not a fan of it myself, but all sources I know say a baby should be at least 6 month old before you start.
3. If you need to keep your baby upright (please, no "sitting" yet!), I suggest you try babywearing. This means using a cloth / sling to carry your baby in an upright, anatomically correct (-> hips!) position in front (later also on your back) of your body. This can be very soothing for the infant, reduce reflux and allow the parent to move, do some housework or go out. Be careful that some of the more rigid carrier systems may not be designed for very small or young babies, most slings can be used from birth. Speaking from experience I can recommend the products of Didymos, but I'm in Germany. Our first child slept in his first year almost exclusively if in close contact to our bodies, so I can relate. Tying these long cloths can feel daunting at first, but usually you get the hang of it really quick. Practice with a teddy bear first...